README.md in tree_clusters-0.8.0 vs README.md in tree_clusters-0.8.1

@@ -18,16 +18,28 @@
 
 Or install it yourself as:
 
     $ gem install tree_clusters
 
-## Documentation
+## Command line scripts
 
+### key_cols
+
+Use this to find key columns in an alignment.  For more information, run
+
+```bash
+key_cols --help
+```
+
+## API 
+
+### Documentation
+
 Checkout
 [TreeClusters docs](http://rubydoc.info/gems/tree_clusters)
 for the full api documentation.
 
-## Usage
+### Usage
 
 Here is a small example.
 
 ```ruby
 # Require the library